Fix LineLength for summary, @file and @var

Problem/Motivation

Part of #2572709: [meta] Fix 'Drupal.Files.LineLength' coding standard

Steps to reproduce

Proposed resolution

Shorten summary lines, @file, and @var lines as needed.

It is not possible to enforce this with a change to phpcs.xml.dist

Remaining tasks

User interface changes

Introduced terminology

API changes

Data model changes

Release notes snippet